#include<iostream>//cin,cout #include<iomanip>//setprecision #include<cstdio>//scanf,printf using namespace std; int main(){ //香蕉，苹果，葡萄 int b=5,a=8,g=12; double average; average = (b+a+g)/3.0; //cout<<fixed<<setprecision(3)<<average<<endl; printf("%.3lf\n",average); //香蕉能买39/b斤,剩下39%b元 printf("%d %d\n",39/b,39%b); printf("%d %d\n",39/a,39%a); printf("%d %d\n",39/g,39%g); return 0; }